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asolove/better.js

Created August 27, 2017 20:38
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  1. asolove created this gist Aug 27, 2017.
    11 changes: 11 additions & 0 deletions better.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,11 @@
    const checkType = (element: 'a' | 'b' | 'c'): string => {
    switch (element) {
    case 'a':
    return 'first';
    case 'b':
    return 'second';
    default:
    (element: empty) // This cast only succeeds if you've already handled every possible case. Otherwise, you will get a type error
    throw new Error()
    }
    }